JP2000150014A - Shortcircuit preventing structure of box with circuits - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box shortcircuit preventing structure capable of preventing circuits from being shortcircuited by a shortcircuit member and reducing the degree of danger. SOLUTION: This structure includes circuits 8, 8', 9, 9' accommodated in a box 21 and at least an opening 25 to admit passage of an electroconductive shortcircuit member 5 capable of short-circuiting the circuits 8, 8', 9, 9'. A shortcircuit member accommodating space 26 allows the member 5 having passed the opening 25 to be isolated from the circuits 8, 8', 9, 9'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing short-circuiting of a box body such as a power supply box or an electric connection box having a circuit body therein.

[0002]

2. Description of the Related Art As a box, for example, a power supply box for an electric vehicle has the following configuration. That is, as shown in FIGS. 5 and 6, the power supply box 1 has a case 2 formed in a rectangular frame shape with a bottom, and inside the case 2, a relay 3 and a circuit body 4 of a known configuration are provided. Are provided.

The relay 3 has fixed portions 3 a at both ends thereof, and is fixed to the bottom wall 6 of the case 2 by tightening bolts 5. On the upper surface of the relay 3, a circuit body 4
Are provided with four connection recesses 7 (see FIG. 5).

As shown in FIG. 5, the circuit body 4 is composed of primary-side bus bars 8, 8 'and secondary-side bus bars 9, 9', each of which is bent into a substantially crank shape in a side view. Have been. One end of each of the primary bus bars 8, 8 '
The other end connected to the corresponding connection recess 7 and led out of the case 2 is connected to a battery (not shown).
Similarly, one end of each of the bus bars 9 and 9 'on the secondary side is connected to the corresponding connection recess 7 similarly to the primary side, and the other end led out of the case 2 is connected to a load (not shown). I have. In addition, the quotation mark with a dash shows the minus (negative) side.

On the other hand, as in the case of the power supply box 1,
As shown in FIG. 7 (refer to FIG. 1 of Japanese Patent Application Laid-Open No. 7-291059), a drive motor controller (box) 11 used in an electric vehicle is three-dimensionally arranged inside thereof. It has a circuit body.

The controller 11 has a bottom wall 12
A terminal block 13 is provided along one side. The bottom wall 12 is provided with a heat-dissipating thick plate 14 and a heat pipe 15 communicating with the outside is embedded.

A plurality of terminals 16a, 16a
b, 16c... are provided, and bus bars 17a, 17b, 1
(Circuit body) are fixed at one ends a, b, c,... By bolts. Also, the bus bars 17a, 17b, 17c
The other ends a ', b', c ',... Are fixed at predetermined positions by bolts or the like (not shown). The bus bars 17a, 17b, 17c... Are three-dimensionally arranged as shown in the figure.

As described above, various circuits are arranged inside the boxes such as the power supply box 1 and the controller 11 according to the form of the box, and are fixed by the bolts 5 and the like.

[0009]

However, in the above-mentioned prior art, the bolt 5 comes off as shown by the arrow B in FIG. 5 due to some factors such as vibration generated while the electric vehicle is running. There is a risk that it will. Moreover, there is a possibility that a part of the bus bars 17a, 17b, 17c ... may be damaged (not shown) due to resonance or the like. If these conductive bolts 5 and the like are straddled between the positive and negative circuit bodies, they will act as a short-circuit member and cause a short circuit. It can happen

Therefore, it is necessary to take measures for preventing the occurrence of a short circuit in the box. As a countermeasure, for example, it is conceivable to make the distance between the positive and negative circuit bodies wider than a part of the dropped bolt or a part of the damaged bus bar to reduce the risk.

However, the size of the entire box is increased as if it goes against the trend of miniaturization in recent years. Therefore, the above-mentioned interval cannot be made wider than necessary, and there is no solution yet. Is the current situation.

The present invention has been made in view of the above-mentioned circumstances, and provides a short-circuit preventing structure for a box body capable of preventing short-circuiting of a circuit body by a short-circuit member and significantly reducing the risk. As an issue.

[0013]

According to a first aspect of the present invention, there is provided a short-circuit preventing structure for a box having a circuit body according to the present invention, wherein the circuit body is provided inside the box. At least an opening through which a conductive short-circuit member capable of short-circuiting the circuit body can pass is provided, and a short-circuit member accommodating space in which the short-circuit member passing through the opening is isolated from the circuit body is provided. Features.

In the above configuration, by providing the short-circuit member accommodating space inside the box, the short-circuit member can be dropped therein. And since it is isolated from the circuit body, it does not cause a short circuit of the circuit body. Accordingly, it is possible to provide a short-circuit preventing structure for a box body that can prevent a short circuit from occurring due to a short-circuit member and significantly reduce the risk.

According to a second aspect of the present invention, there is provided a box body including a circuit body according to the first aspect of the present invention, wherein the opening is formed in the box body. It is characterized in that it is arranged in the vicinity of a fixed part such as an electric component provided inside.

In the above configuration, since the opening of the short-circuit member accommodating space is arranged near the fixing portion for the electric component or the like provided inside the box, the fixing member for the electric component or the like comes off or breaks. Even if it becomes a short-circuit member, it immediately falls into the short-circuit member accommodating space and does not cause a short circuit of the circuit body. Therefore, the short-circuit member can be easily dropped into the short-circuit member accommodation space, and the degree of danger can be further reduced.

According to a third aspect of the present invention, there is provided a box body provided with a circuit body according to the present invention, wherein the circuit body is provided with the circuit body rather than the fixing portion. A wall that separates the opening from the circuit body is provided at or near the edge of the opening on the body side.

In the above configuration, since the wall separating the opening and the circuit body is provided at or near the edge of the opening on the circuit body side with respect to the fixing part of the electric component or the like, the provisional fixing is performed. Even if the member scatters, it can be bounced off the wall. Therefore, even if the short-circuit member scatters, the short-circuit member can be easily dropped into the short-circuit member accommodation space, and the risk can be further reduced.

According to a fourth aspect of the present invention, there is provided a box body provided with a circuit body according to any one of the first to third aspects. The member accommodating space is formed by being divided by a bottom wall of the box and a cover attached to the bottom wall.

In the above configuration, the short-circuit member accommodating space is formed by partitioning the bottom wall of the box and the cover attached to the bottom wall side. However, even if the short prevention structure is used, the size does not increase. Further, the structure is simple and does not affect the manufacturability.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a power supply box showing an embodiment of a structure for preventing short-circuit of a box provided with a circuit body of the present invention. FIG. 2 is a longitudinal sectional view of FIG. It should be noted that the same components as those of the conventional example (the power supply box 1 shown in FIGS. 5 and 6) are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, a power supply box indicated by reference numeral 21 (corresponding to a box described in the claims)
As in the prior art, the relay 3 (corresponding to an electric component or the like described in the claims) is fixed in the case 22 and the circuit body 4
Are connected to the primary-side bus bars 8, 8 'and the secondary-side bus bars 9, 9', respectively.

In FIG. 2, the case 22 has a bottom wall 23 of the case 22 and the primary side bus bars 8, 8 '.
A partition 24 parallel to the bottom wall 23 is provided between the secondary busbars 9 and 9 ′ and the relay 3.
Are fixed by bolts 5 (corresponding to short-circuit members described in the claims).

In the partition 24, four openings 25 in plan view as shown in FIG. 1 are formed in the vicinity of the fixing portion 3a of the relay 3 fixed by the bolt 5. Opening 2
Reference numeral 5 denotes an opening which is at least large enough to allow the bolt 5 to pass therethrough, so that the bolt 5 can be dropped into a short-circuit member accommodation space 26 formed by the partition wall 24 and the bottom wall 23.

Therefore, the bolt 5 may be displaced by some factor such as vibration.
2 can be dropped into the short-circuit member accommodating space 26 even if it comes off as indicated by the arrow A shown in FIG.
Alternatively, no short circuit occurs between the bus bars 9 and 9 ′, and the risk is significantly reduced as compared with the related art.

In the above configuration, if there is an empty space above the case 22, the relay 3 and the like are offset toward that space, so that the short-circuit member housing space 26 can be easily formed on the bottom wall 23 side. it can.

Although not specifically shown, for example, the bottom wall 2
If the above-mentioned opening 25 is formed in 3 and a known undercover (corresponding to the cover described in the claims) is attached, a space similar to the short-circuit member housing space 26 is formed by the bottom wall 23 and the undercover. It can be easily partitioned.

Next, another embodiment will be described with reference to FIGS. FIG. 3 is a plan view of the power supply box, and FIG. 4 is a longitudinal sectional view of FIG.

As shown in FIGS. 3 and 4, the power supply box 31 has basically the same configuration as that of the power supply box 21, but a wall 32 is provided near the edge of each opening 25. .

As shown in FIG. 3, the wall 32 is disposed between the bus bars 8, 8 'and between the bus bars 9, 9' and the fixing portion 3a (or the edge of the opening 25). Even if scattered, the bolt 5 hits the wall 32 and falls into the short-circuit member accommodating space 26. Therefore, by providing the wall 32, the degree of danger can be further reduced.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the gist of the present invention.

The box body is not limited to the power supply boxes 21 and 31, but includes the conventional control box 11, a known junction block, an electric connection box, and the like. The member shall be separable from the circuit body.

The short-circuit member is not limited to the bolt 5 or the damaged bus bar, but naturally includes any conductive member that may cause a short circuit.

Further, the position of the opening 25 of the short-circuit member accommodating space 26 can be appropriately set in accordance with the mounting position of the electrical components such as the relay 3 and the fuse (not shown).

[0035]

As described above, according to the first aspect of the present invention, by providing the short-circuit member accommodating space inside the box, the short-circuit member can be dropped therein. . And since it is isolated from the circuit body, it does not cause a short circuit of the circuit body. Therefore, the short circuit member can be prevented from being short-circuited beforehand, and an effect of providing a short-circuit preventing structure for a box body that can significantly reduce the risk can be provided.

According to the second aspect of the present invention, since the opening of the short-circuit member accommodating space is arranged near the fixing portion of the electric component or the like provided inside the box, the electric component or the like is provided. Even if the fixing member is detached or damaged and becomes a short-circuit member, the fixing member immediately falls into the short-circuit member accommodating space and does not cause a short circuit. Therefore, it is easy to drop the short-circuit member into the short-circuit member accommodation space, and it is possible to further reduce the risk.

According to the third aspect of the present invention, the wall separating the opening and the circuit body is provided at the edge of the opening closer to the circuit body than the fixed part of the electric component or the like or near the edge. Since it is provided, even if the fixing member splatters, it can be bounced off the wall. Therefore, even if the short-circuit member is scattered, the short-circuit member is more easily dropped into the short-circuit member accommodation space, and the danger can be further reduced.

According to the fourth aspect of the present invention, the short-circuit member accommodating space is formed by being divided by the bottom wall of the box and the cover attached to the bottom wall. In the case of a box to which a cover is attached, the size does not increase even if the short prevention structure is used. Further, the structure is simple and does not affect the manufacturability.

[Brief description of the drawings]

FIG. 1 is a plan view of a power supply box showing an embodiment of a short circuit prevention structure for a box provided with a circuit body according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a plan view of a power supply box showing another embodiment of a short-circuit prevention structure for a box provided with a circuit body according to the present invention.

FIG. 4 is a longitudinal sectional view of FIG.

FIG. 5 is a plan view of a conventional power supply box.

FIG. 6 is a longitudinal sectional view of FIG.

FIG. 7 is an internal perspective view of a controller of another conventional driving motor.

[Explanation of symbols]

 Reference Signs List 3 relay (electric part) 3a fixing part 5 bolt (short circuit member) 8, 8 ', 9, 9' bus bar (circuit body) 21, 31 power supply box (box body) 22 case 23 bottom wall 24 partition wall 25 opening 26 short circuit member Storage space 32 walls

Claims (4)

[Claims] 1. A short circuit member having a circuit body inside a box body and having at least an opening through which a conductive short circuit member capable of short-circuiting the circuit body can pass, and the short circuit member passing through the opening. Wherein a short-circuit member accommodating space is provided which is isolated from the circuit body. 2. The structure for preventing short-circuiting of a box provided with a circuit body according to claim 1, wherein the opening is arranged near a fixing portion such as an electric component provided inside the box. A short-circuit prevention structure of a box body with a circuit body. 3. The short-circuit preventing structure for a box provided with a circuit body according to claim 2, wherein the opening is provided at an edge of the opening closer to the circuit body than the fixing portion or near the edge. A short-circuit preventing structure for a box provided with a circuit body, wherein a wall separating the circuit body is provided. 4. The short-circuit prevention structure for a box provided with the circuit body according to claim 1, wherein the short-circuit member accommodating space is mounted on a bottom wall of the box and on a side of the bottom wall. A short-circuit prevention structure for a box provided with a circuit body, wherein the box body is formed by being divided by a cover.